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          光纤光学笔记
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        <p>入门好痛苦，那就现在开始记录笔记吧</p>
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<p>笔记来源：1.书籍：《光纤光学》，作者：廖延彪 2.中国MOOC视频 3.百度百科 4.网络上博主写的笔记</p>
<p>相关量化指标<br>1 SSIM  越大越好<br>2 PSNR  dB为单位的 越大越好？<br>3 MAE 平均绝对误差  越小越好<br>4 NPCC 因为网络解决了回归问题，所以调整回归问题的损失对于优化网络性能是至关重要的。尽管均方误差(MSE)和平均误差(MAE)损失函数对于回归问题是常见的，但研究表明，它们对于该问题来说并不太好，因为输入图像是与基本事实不完全相似的图像。因此，我们选择使用负皮尔逊相关系数(NPCC)损失函数，该函数对这类问题有效</p>
<p>1.折射率：光在真空中的传播速度与光在该介质中的传播速度之比<br>2.按纤芯折射率分布：1.阶跃折射率光纤(SIOF)—纤芯和包层分界面处，折射率发生突变，2.梯度(渐变)折射率光纤(GIOF)—折射率按照一定函数关系随光纤中心径向距离而连续变化<br>3.光纤结构：纤芯，包层，涂覆层<br>4.纤芯折射率大于芯包折射率是因为要满足全反射条件<br>5.全反射的充要条件：1.光从光密介质射到它与光疏介质的界面上 2.入射角等于或大于临界角<br>6.相干光：在传播过程中保持相同的相位差，可以发生干涉现象的光<br>7.光学4F系统:最简单的来说就是：有两个焦距为f的透镜，相距2f，物距为f，相距也为f。所以是4f系统。只有距离大于4f的系统才能做变焦系统。</p>
<p>需要解决的盲区：<br>1.相干照明，非相干照明<br>2.计算光学成像领域中，经常使用的神经网络总 体结构是 U 型结构(应该指U-NET结构)</p>
<p>看论文了解到的知识：<br>1.通常通过使用空间光调制器(SLM)来实现波前整形<br>2.CCD是电荷耦合器件（charge coupled device）的简称，它能够将光线变为电荷并将电荷存储及转移，也可将存储之电荷取出使电压发生变化，因此是理想的CCD相机元件，以其构成的CCD相机具有体积小、重量轻、不受磁场影响、具有抗震动和撞击之特性而被广泛应用。<br>3.DMD(Digital Micromirror Device)数字微镜器件是光开关的一种，利用旋转反射镜实现光开关的开合，开闭时间稍长，为微秒量级。作用过程十分简单，光从光纤中出来，射向DMD的反射镜片，DMD打开的时候，光可经过对称光路进入到另一端光纤；当DMD关闭的时候，即DMD的反射镜产生一个小的旋转，光经过反射后，无法进入对称的另一端，也就达到了光开关关闭的效果。<a target="_blank" rel="noopener" href="https://www.sohu.com/a/255275407_99961126">https://www.sohu.com/a/255275407_99961126</a><br>4.皮尔森相关系数也称皮尔森积矩相关系数(Pearson product-moment correlation coefficient) ，是一种线性相关系数，是最常用的一种相关系数。记为r，用来反映两个变量X和Y的线性相关程度，r值介于-1到1之间，绝对值越大表明相关性越强。<br>5.SSIM(在论文补充材料后面有)SSIM取值范围[0,1]，值越大，表示图像失真越小。<br>6.随机介质能够显著地提高成像系统的有效值孔径及视场<br>7.测量随机介质传输矩阵的两个方法:1.从空间域直接测量 2.从空频域的角度测量<br>8.多模光纤的散射作用是由模间色散引起，各模式间因群速度不同从而导致色散</p>
<p>~.论文上接触到的英语词汇：<br>1.伪影(Artifacts)是指原本被扫描物体并不存在而在图像上却出现的各种形态的影像，伪影大致分为与患者有关和与机器有关的两类。<br>2.grayscale：灰度图<br>3.diffuser:慢射体<br>4.Pearson correlation coefficient (PCC)：皮尔逊相关系数<br>5.specklegram：散斑图<br>6.coupling:耦合<br>7.Phase Retrieval:相位恢复算法<br>8.dispersion:色散<br>9.modal dispersion = intermodal dispersion 模间色散<br>10.chromatic dispersion = intramodal dispersion 模内色散<br>11.spectra光谱<br>12.superpositions叠加<br>13.scattering media散射介质<br>14.aberrations像差<br>15.granular颗粒<br>16.DP是diffraction pattern 的简写，意为衍射图样<br>17.optical depth 光学深度<br>18.transmission matrix 传输矩阵<br>19.transport free path:自由传播路程<br>20.transport mean free path:平均传播自由程<br>21.optical memory effect:光学记忆效应<br>22.space–bandwidth product:空间带宽积</p>
<p>光学涉及的数学<br>Hadamard Product：矩阵对应位置相乘</p>

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